Fan-wheel and casing.



PATENTED MAY 26, 1908.

W. W. GREEN. FAN WHEEL AND GASING.

APPLICATION FILED JUNE 8. 1907.

2 $HBETSSHEET 1.-

PATBNTBD MAY 26, 1908. W. W. GREEN.

FAN WHEEL AND GASING.'

APPLIGATION FILED JUNE 8. 190 7 2 SHEETS-SHEET 2.

STATES PATT WILLIAM W. GREEN, OF CHICAGO, ILLINOIS, ASSIGNOR TO GARDEN CITY FAN COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

FAN-WHEEL AND CASING.

Specification of Letters Patent.

Patented May 26, 1908.

Application filed June 8, 1907. Serial No. 377,912.

To all whom it may concern:

Be it known that I, WILLIAM WV. GREEN, a citizen of the United States of America, and resident of Chicago, Illinois, have invented a certain new and useful Im rovement in Fanl/Vheels and Casings, of W ich the following is a specification.

My invention relates to improvements in fan wheels and casings or housings and has for its object the production of a device by means of which the disadvantages incident to back pressure may be eliminated in a large degree, and the efficiency of the device brought to a maximum.

A further object is the production of a device that can be economically constructed, and yet be strong and durable.

These and such other objects as may hereinafter appear are attained by my device, embodiments of which are illustrated in the accompanying drawings, in which,

Figure 1 is a sectional view on the line 11 of Fig. 2, looking in the direction indi cated by the arrows. Fig. 2 is a side elevation of Fig. 1 with half the housing and inlet pipe removed. Fig. 3 is a sectional view on the line 33 of Fig. 2, looking in the direction indicated by the arrows.

Like numerals of reference indicate like parts in the several figures of the drawing.

Referring now to the drawing, 1 represents a shaft on which is journaled a fan 5. This shaft is seated in bearings 67 on a yoke frame casting 8. Power is transmitted to the fan through the medium of a pulley 9, journaled on the shaft. The fan 5 comprises a central hub 10 provided with a series of radially extending bearing bosses 11. These bosses are preferable channeled, as shown at 12, and provided with flanges 13. The webs 14 on the T braces 15 fit within these channels, the flanges 16 of the brace fitting between the flanges 13. These braces are firmly secured in place by means of bolts or rivets in any well known manner, or may be cast therein. The fan blades 17 are riveted or secured to the braces 15, and terminate in curved end portions 18. A circular guard or disk 19 is secured to the hub, and the fan blades are riveted or secured thereto by means of outwardly extending ears 20 preferably integral with the blades and bent to coincide with the angle of the disk. Surrounding the fan 5 is a metallic housing 21 constructed in the main in the usual manner,

provided with an inlet 22 opposite the center of the fan, and having a discharge opening 23. The inlet pipe 24 is provided with an enlarged portion 25 adjacent to the housing forming a chamber 26.

The fan itself is so placed on the shaft and in the housing as to closely abut the inlet side 27 of the housing, and leaving a considerable space between the side of the fan and disk and the opposite side 28 of the housing, thus forming a chamber 29 therebetween. A chamber 30 is also formed below the fan and adjacent to the discharge opening 23. In the operation of this device, the revolution of the fan forces the air into the chambers 29 and 30. The angle of the blades with respect to the plane of revolution and the degree of curvature of the ends of the blades is such that the air is discharged from the fan into the chambers with a minimum of friction. The discharge of the air from the fan creates a vacuum drawing in the air through the intake 22. As this intake comprises first a restricted passage, the air sucked therethrough becomes somewhat compressed, but on entering the chamber 26 the area of the opening is increased with a consequent expansion of the air and a reduction in friction. I have found the results obtained from this form of intake very satisfactory. The centrifugal force resulting from the high revolution of the fan normally tends to throw the air from the ends of the fan blades, but the angle of inclination of said blades to the axis of revolution, together with the curvature at the end is so designed that the air is forced on, as it were, piled up in the chamber 26 above and below the periphery of the disk 19. With the ordinary fan the vacuum normally existing in the center of the fan tends to draw the air thrown into the chamber back into the center of the fan, thus setting up a counter current of air retarding the inflow of fresh air through the intake and greatly impairing the efficiency of the device. By theuse of the disk 19, however, the air forced into the chamber 29 by the fan is prevented from returning into the path of the air from the intake but is forced between the disk and the side 28 of the housing. The angle of the blades and the revolution of the fan is so regulated that the air cannot pass back between the blades, owing to the centrifugal tendency of the incoming air, but is forced downwardly into the chamber 30 and through the discharge opening 23. The blades of the fan being in position very close to the side 27 of the housing, there is little, if any, opportunity given for air to enter the housing without being acted upon by the fan. This arrangement of the parts of the structure prevents formation of side and back cur rents, and greatly increases the efliciency of the device. It will also be noted that the curve at the end of the blades is so proportioned as to facilitate the discharge of air When the blades are opposite the discharge opening.

I claim:

1. A device of the class described comprising a housing, a shaft, a fan comprising a central hub, a series of blades angularly disposed to said shaft, said ends terminating in curved ends, said housing being provided with an inlet opposite the center of said fan and an out let extending from the lower part thereof, the blades of said fan being in close proximity to the inlet side of said housing, a chamber or open air space being formed between the fan and opposite side.

2. A device of the class described con1pris ing a shaft, a fan seated thereon, and a housing inclosing the fan, said fan comprising a hub, a series of radially extending blades angularly disposed to the line of said shaft and a circular plate or disk surrounding said shaft and extending to the inner periphery of the blades.

3. A device of the class described comprising a shaft, a fan seated thereon, and a housing inclosing the fan, said fan com rising a hub, a series of radially extending b ades angularly disposed to the line of said shaft and a circular plate or disk surrounding said shaft and extending to the inner periphery of the blades, said blades being secured to said disks.

. 4. A device of the class described comprising a shaft, a fan seated thereon, and a housing inclosing the fan, said fan comprising a hub, a series of radially extending blades angularly disposed to the line of said shaft and a circular plate or disk surrounding said shaft and extending to the inner periphery of the blades, said blades being secured to said disks, said fan and disks being so positioned in said housing as to form a chamber between said disk and the side of the housing opposite the intake.

5. A device of the class described compris ing a shaft, a fan seated thereon, and a housing inclosing the fan, said fan com rising a hub, a series of radially extending b ades angularly disposed to the line of said shaft terminating in a curved end and a circular plate or disk surrounding said shaft and extending to the inner periphery of the blades.

6. A device of the class described comprising a shaft, a fan seated thereon, and a housing inclosing the fan, said fan comprising a hub, a series of radially extending blades angularly disposed to the line of said shaft terminating in a curved end and a circular plate or disk surrounding said shaft and extending to the inner periphery of the blades, said blades being secured to said disks.

7. A device of the class described comprising a shaft, a fan seated thereon, and a housing inclosing the fan, said fan com rising a hub, a series of radially extendingb ades angularly disposed to the line of said shaft terminating in a curved end and a circular plate or disk surrounding said shaft and extending to the innre periphery of the blades, said blades being secured to said disks, said fan and disks being so positioned in said housing as to form a chamber between said disk and the side of the housing opposite the intake.

8. A device of the class described comprising a shaft, a fan seated thereon, and a housing inclosing the fan, said fan com arising a hub, a series of radially extending b ades removably secured to said hub angularly disposed to the line of said shaft and a circular plate or disk surrounding said shaft and extending to the inner periphery of the blades.

9. A device of the class described comprising a housing, a shaft, a fan comprising a central hub, and a series of blades angularly disposed to said shaft, said ends terminating in curved ends, said housing being provided with an inlet opposite the center of said fan and an outlet extending from the lower part thereof, said inlet comprising a restricted passage and an enlarged chamber adjacent to said fan.

10. In a device of the class described the combination of a shaft, a fan journaled thereon, and a housing surrounding said fan, said fan being positioned on said shaft in close proximity to the inlet side of said housing, said fan comprising a hub, a series of blades extending radially therefrom angularly disposed to said shaft, said housing being provided With a restricted inlet pipe having an enlarged portion adjacent to said housing forming a chamber adjacent to said fan, and a discharge opening on the opposite side of said fan.

Signed by me at Chicago, Illinois, this 1st day of June, 1907.

\VILLIAM W. GREEN. Witnesses:

ALBERT JOHN SAUsER, SARAH LEWIS. 

